git.oblomov.eu Git - git/blob - http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14
  15 #include <expat.h>
  16
  17 static const char http_push_usage[] =
  18 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20 #ifndef XML_STATUS_OK
  21 enum XML_Status {
  22   XML_STATUS_OK = 1,
  23   XML_STATUS_ERROR = 0
  24 };
  25 #define XML_STATUS_OK    1
  26 #define XML_STATUS_ERROR 0
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 /* DAV methods */
  33 #define DAV_LOCK "LOCK"
  34 #define DAV_MKCOL "MKCOL"
  35 #define DAV_MOVE "MOVE"
  36 #define DAV_PROPFIND "PROPFIND"
  37 #define DAV_PUT "PUT"
  38 #define DAV_UNLOCK "UNLOCK"
  39 #define DAV_DELETE "DELETE"
  40
  41 /* DAV lock flags */
  42 #define DAV_PROP_LOCKWR (1u << 0)
  43 #define DAV_PROP_LOCKEX (1u << 1)
  44 #define DAV_LOCK_OK (1u << 2)
  45
  46 /* DAV XML properties */
  47 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53 #define DAV_PROPFIND_RESP ".multistatus.response"
  54 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  55 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57 /* DAV request body templates */
  58 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  59 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  61
  62 #define LOCK_TIME 600
  63 #define LOCK_REFRESH 30
  64
  65 /* bits #0-15 in revision.h */
  66
  67 #define LOCAL    (1u<<16)
  68 #define REMOTE   (1u<<17)
  69 #define FETCHING (1u<<18)
  70 #define PUSHING  (1u<<19)
  71
  72 /* We allow "recursive" symbolic refs. Only within reason, though */
  73 #define MAXDEPTH 5
  74
  75 static int pushing;
  76 static int aborted;
  77 static signed char remote_dir_exists[256];
  78
  79 static struct curl_slist *no_pragma_header;
  80
  81 static int push_verbosely;
  82 static int push_all = MATCH_REFS_NONE;
  83 static int force_all;
  84 static int dry_run;
  85
  86 static struct object_list *objects;
  87
  88 struct repo
  89 {
  90         char *url;
  91         char *path;
  92         int path_len;
  93         int has_info_refs;
  94         int can_update_info_refs;
  95         int has_info_packs;
  96         struct packed_git *packs;
  97         struct remote_lock *locks;
  98 };
  99
 100 static struct repo *repo;
 101
 102 enum transfer_state {
 103         NEED_FETCH,
 104         RUN_FETCH_LOOSE,
 105         RUN_FETCH_PACKED,
 106         NEED_PUSH,
 107         RUN_MKCOL,
 108         RUN_PUT,
 109         RUN_MOVE,
 110         ABORTED,
 111         COMPLETE,
 112 };
 113
 114 struct transfer_request
 115 {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         char filename[PATH_MAX];
 123         char tmpfile[PATH_MAX];
 124         int local_fileno;
 125         FILE *local_stream;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         unsigned char real_sha1[20];
 131         git_SHA_CTX c;
 132         z_stream stream;
 133         int zret;
 134         int rename;
 135         void *userData;
 136         struct active_request_slot *slot;
 137         struct transfer_request *next;
 138 };
 139
 140 static struct transfer_request *request_queue_head;
 141
 142 struct xml_ctx
 143 {
 144         char *name;
 145         int len;
 146         char *cdata;
 147         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148         void *userData;
 149 };
 150
 151 struct remote_lock
 152 {
 153         char *url;
 154         char *owner;
 155         char *token;
 156         char tmpfile_suffix[41];
 157         time_t start_time;
 158         long timeout;
 159         int refreshing;
 160         struct remote_lock *next;
 161 };
 162
 163 /* Flags that control remote_ls processing */
 164 #define PROCESS_FILES (1u << 0)
 165 #define PROCESS_DIRS  (1u << 1)
 166 #define RECURSIVE     (1u << 2)
 167
 168 /* Flags that remote_ls passes to callback functions */
 169 #define IS_DIR (1u << 0)
 170
 171 struct remote_ls_ctx
 172 {
 173         char *path;
 174         void (*userFunc)(struct remote_ls_ctx *ls);
 175         void *userData;
 176         int flags;
 177         char *dentry_name;
 178         int dentry_flags;
 179         struct remote_ls_ctx *parent;
 180 };
 181
 182 /* get_dav_token_headers options */
 183 enum dav_header_flag {
 184         DAV_HEADER_IF = (1u << 0),
 185         DAV_HEADER_LOCK = (1u << 1),
 186         DAV_HEADER_TIMEOUT = (1u << 2)
 187 };
 188
 189 static char *xml_entities(char *s)
 190 {
 191         struct strbuf buf = STRBUF_INIT;
 192         while (*s) {
 193                 size_t len = strcspn(s, "\"<>&");
 194                 strbuf_add(&buf, s, len);
 195                 s += len;
 196                 switch (*s) {
 197                 case '"':
 198                         strbuf_addstr(&buf, "&quot;");
 199                         break;
 200                 case '<':
 201                         strbuf_addstr(&buf, "&lt;");
 202                         break;
 203                 case '>':
 204                         strbuf_addstr(&buf, "&gt;");
 205                         break;
 206                 case '&':
 207                         strbuf_addstr(&buf, "&amp;");
 208                         break;
 209                 }
 210                 s++;
 211         }
 212         return strbuf_detach(&buf, NULL);
 213 }
 214
 215 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 216 {
 217         struct strbuf buf = STRBUF_INIT;
 218         struct curl_slist *dav_headers = NULL;
 219
 220         if (options & DAV_HEADER_IF) {
 221                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                 strbuf_reset(&buf);
 224         }
 225         if (options & DAV_HEADER_LOCK) {
 226                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 227                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 228                 strbuf_reset(&buf);
 229         }
 230         if (options & DAV_HEADER_TIMEOUT) {
 231                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 232                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 233                 strbuf_reset(&buf);
 234         }
 235         strbuf_release(&buf);
 236
 237         return dav_headers;
 238 }
 239
 240 static void append_remote_object_url(struct strbuf *buf, const char *url,
 241                                      const char *hex,
 242                                      int only_two_digit_prefix)
 243 {
 244         strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 245         if (!only_two_digit_prefix)
 246                 strbuf_addf(buf, "%s", hex+2);
 247 }
 248
 249 static void finish_request(struct transfer_request *request);
 250 static void release_request(struct transfer_request *request);
 251
 252 static void process_response(void *callback_data)
 253 {
 254         struct transfer_request *request =
 255                 (struct transfer_request *)callback_data;
 256
 257         finish_request(request);
 258 }
 259
 260 #ifdef USE_CURL_MULTI
 261
 262 static char *get_remote_object_url(const char *url, const char *hex,
 263                                    int only_two_digit_prefix)
 264 {
 265         struct strbuf buf = STRBUF_INIT;
 266         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 267         return strbuf_detach(&buf, NULL);
 268 }
 269
 270 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 271                                void *data)
 272 {
 273         unsigned char expn[4096];
 274         size_t size = eltsize * nmemb;
 275         int posn = 0;
 276         struct transfer_request *request = (struct transfer_request *)data;
 277         do {
 278                 ssize_t retval = xwrite(request->local_fileno,
 279                                        (char *) ptr + posn, size - posn);
 280                 if (retval < 0)
 281                         return posn;
 282                 posn += retval;
 283         } while (posn < size);
 284
 285         request->stream.avail_in = size;
 286         request->stream.next_in = ptr;
 287         do {
 288                 request->stream.next_out = expn;
 289                 request->stream.avail_out = sizeof(expn);
 290                 request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 291                 git_SHA1_Update(&request->c, expn,
 292                             sizeof(expn) - request->stream.avail_out);
 293         } while (request->stream.avail_in && request->zret == Z_OK);
 294         data_received++;
 295         return size;
 296 }
 297
 298 static void start_fetch_loose(struct transfer_request *request)
 299 {
 300         char *hex = sha1_to_hex(request->obj->sha1);
 301         char *filename;
 302         char prevfile[PATH_MAX];
 303         char *url;
 304         int prevlocal;
 305         unsigned char prev_buf[PREV_BUF_SIZE];
 306         ssize_t prev_read = 0;
 307         long prev_posn = 0;
 308         char range[RANGE_HEADER_SIZE];
 309         struct curl_slist *range_header = NULL;
 310         struct active_request_slot *slot;
 311
 312         filename = sha1_file_name(request->obj->sha1);
 313         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 314         snprintf(request->tmpfile, sizeof(request->tmpfile),
 315                  "%s.temp", filename);
 316
 317         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 318         unlink_or_warn(prevfile);
 319         rename(request->tmpfile, prevfile);
 320         unlink_or_warn(request->tmpfile);
 321
 322         if (request->local_fileno != -1)
 323                 error("fd leakage in start: %d", request->local_fileno);
 324         request->local_fileno = open(request->tmpfile,
 325                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 326         /* This could have failed due to the "lazy directory creation";
 327          * try to mkdir the last path component.
 328          */
 329         if (request->local_fileno < 0 && errno == ENOENT) {
 330                 char *dir = strrchr(request->tmpfile, '/');
 331                 if (dir) {
 332                         *dir = 0;
 333                         mkdir(request->tmpfile, 0777);
 334                         *dir = '/';
 335                 }
 336                 request->local_fileno = open(request->tmpfile,
 337                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 338         }
 339
 340         if (request->local_fileno < 0) {
 341                 request->state = ABORTED;
 342                 error("Couldn't create temporary file %s for %s: %s",
 343                       request->tmpfile, request->filename, strerror(errno));
 344                 return;
 345         }
 346
 347         memset(&request->stream, 0, sizeof(request->stream));
 348
 349         git_inflate_init(&request->stream);
 350
 351         git_SHA1_Init(&request->c);
 352
 353         url = get_remote_object_url(repo->url, hex, 0);
 354         request->url = xstrdup(url);
 355
 356         /* If a previous temp file is present, process what was already
 357            fetched. */
 358         prevlocal = open(prevfile, O_RDONLY);
 359         if (prevlocal != -1) {
 360                 do {
 361                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 362                         if (prev_read>0) {
 363                                 if (fwrite_sha1_file(prev_buf,
 364                                                      1,
 365                                                      prev_read,
 366                                                      request) == prev_read) {
 367                                         prev_posn += prev_read;
 368                                 } else {
 369                                         prev_read = -1;
 370                                 }
 371                         }
 372                 } while (prev_read > 0);
 373                 close(prevlocal);
 374         }
 375         unlink_or_warn(prevfile);
 376
 377         /* Reset inflate/SHA1 if there was an error reading the previous temp
 378            file; also rewind to the beginning of the local file. */
 379         if (prev_read == -1) {
 380                 memset(&request->stream, 0, sizeof(request->stream));
 381                 git_inflate_init(&request->stream);
 382                 git_SHA1_Init(&request->c);
 383                 if (prev_posn>0) {
 384                         prev_posn = 0;
 385                         lseek(request->local_fileno, 0, SEEK_SET);
 386                         ftruncate(request->local_fileno, 0);
 387                 }
 388         }
 389
 390         slot = get_active_slot();
 391         slot->callback_func = process_response;
 392         slot->callback_data = request;
 393         request->slot = slot;
 394
 395         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 396         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 397         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 398         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 399         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 400
 401         /* If we have successfully processed data from a previous fetch
 402            attempt, only fetch the data we don't already have. */
 403         if (prev_posn>0) {
 404                 if (push_verbosely)
 405                         fprintf(stderr,
 406                                 "Resuming fetch of object %s at byte %ld\n",
 407                                 hex, prev_posn);
 408                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 409                 range_header = curl_slist_append(range_header, range);
 410                 curl_easy_setopt(slot->curl,
 411                                  CURLOPT_HTTPHEADER, range_header);
 412         }
 413
 414         /* Try to get the request started, abort the request on error */
 415         request->state = RUN_FETCH_LOOSE;
 416         if (!start_active_slot(slot)) {
 417                 fprintf(stderr, "Unable to start GET request\n");
 418                 repo->can_update_info_refs = 0;
 419                 release_request(request);
 420         }
 421 }
 422
 423 static void start_mkcol(struct transfer_request *request)
 424 {
 425         char *hex = sha1_to_hex(request->obj->sha1);
 426         struct active_request_slot *slot;
 427
 428         request->url = get_remote_object_url(repo->url, hex, 1);
 429
 430         slot = get_active_slot();
 431         slot->callback_func = process_response;
 432         slot->callback_data = request;
 433         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 434         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 435         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 436         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 437         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 438
 439         if (start_active_slot(slot)) {
 440                 request->slot = slot;
 441                 request->state = RUN_MKCOL;
 442         } else {
 443                 request->state = ABORTED;
 444                 free(request->url);
 445                 request->url = NULL;
 446         }
 447 }
 448 #endif
 449
 450 static void start_fetch_packed(struct transfer_request *request)
 451 {
 452         char *url;
 453         struct packed_git *target;
 454         FILE *packfile;
 455         char *filename;
 456         long prev_posn = 0;
 457         char range[RANGE_HEADER_SIZE];
 458         struct curl_slist *range_header = NULL;
 459
 460         struct transfer_request *check_request = request_queue_head;
 461         struct active_request_slot *slot;
 462
 463         target = find_sha1_pack(request->obj->sha1, repo->packs);
 464         if (!target) {
 465                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 466                 repo->can_update_info_refs = 0;
 467                 release_request(request);
 468                 return;
 469         }
 470
 471         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 472         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 473
 474         filename = sha1_pack_name(target->sha1);
 475         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 476         snprintf(request->tmpfile, sizeof(request->tmpfile),
 477                  "%s.temp", filename);
 478
 479         url = xmalloc(strlen(repo->url) + 64);
 480         sprintf(url, "%sobjects/pack/pack-%s.pack",
 481                 repo->url, sha1_to_hex(target->sha1));
 482
 483         /* Make sure there isn't another open request for this pack */
 484         while (check_request) {
 485                 if (check_request->state == RUN_FETCH_PACKED &&
 486                     !strcmp(check_request->url, url)) {
 487                         free(url);
 488                         release_request(request);
 489                         return;
 490                 }
 491                 check_request = check_request->next;
 492         }
 493
 494         packfile = fopen(request->tmpfile, "a");
 495         if (!packfile) {
 496                 fprintf(stderr, "Unable to open local file %s for pack",
 497                         request->tmpfile);
 498                 repo->can_update_info_refs = 0;
 499                 free(url);
 500                 return;
 501         }
 502
 503         slot = get_active_slot();
 504         slot->callback_func = process_response;
 505         slot->callback_data = request;
 506         request->slot = slot;
 507         request->local_stream = packfile;
 508         request->userData = target;
 509
 510         request->url = url;
 511         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 512         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 513         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 514         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 515         slot->local = packfile;
 516
 517         /* If there is data present from a previous transfer attempt,
 518            resume where it left off */
 519         prev_posn = ftell(packfile);
 520         if (prev_posn>0) {
 521                 if (push_verbosely)
 522                         fprintf(stderr,
 523                                 "Resuming fetch of pack %s at byte %ld\n",
 524                                 sha1_to_hex(target->sha1), prev_posn);
 525                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 526                 range_header = curl_slist_append(range_header, range);
 527                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 528         }
 529
 530         /* Try to get the request started, abort the request on error */
 531         request->state = RUN_FETCH_PACKED;
 532         if (!start_active_slot(slot)) {
 533                 fprintf(stderr, "Unable to start GET request\n");
 534                 repo->can_update_info_refs = 0;
 535                 release_request(request);
 536         }
 537 }
 538
 539 static void start_put(struct transfer_request *request)
 540 {
 541         char *hex = sha1_to_hex(request->obj->sha1);
 542         struct active_request_slot *slot;
 543         struct strbuf buf = STRBUF_INIT;
 544         enum object_type type;
 545         char hdr[50];
 546         void *unpacked;
 547         unsigned long len;
 548         int hdrlen;
 549         ssize_t size;
 550         z_stream stream;
 551
 552         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 553         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 554
 555         /* Set it up */
 556         memset(&stream, 0, sizeof(stream));
 557         deflateInit(&stream, zlib_compression_level);
 558         size = deflateBound(&stream, len + hdrlen);
 559         strbuf_init(&request->buffer.buf, size);
 560         request->buffer.posn = 0;
 561
 562         /* Compress it */
 563         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 564         stream.avail_out = size;
 565
 566         /* First header.. */
 567         stream.next_in = (void *)hdr;
 568         stream.avail_in = hdrlen;
 569         while (deflate(&stream, 0) == Z_OK)
 570                 /* nothing */;
 571
 572         /* Then the data itself.. */
 573         stream.next_in = unpacked;
 574         stream.avail_in = len;
 575         while (deflate(&stream, Z_FINISH) == Z_OK)
 576                 /* nothing */;
 577         deflateEnd(&stream);
 578         free(unpacked);
 579
 580         request->buffer.buf.len = stream.total_out;
 581
 582         strbuf_addstr(&buf, "Destination: ");
 583         append_remote_object_url(&buf, repo->url, hex, 0);
 584         request->dest = strbuf_detach(&buf, NULL);
 585
 586         append_remote_object_url(&buf, repo->url, hex, 0);
 587         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 588         request->url = strbuf_detach(&buf, NULL);
 589
 590         slot = get_active_slot();
 591         slot->callback_func = process_response;
 592         slot->callback_data = request;
 593         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 594         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 595         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 596 #ifndef NO_CURL_IOCTL
 597         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 598         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 599 #endif
 600         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 601         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 602         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 603         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 604         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 605         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 606
 607         if (start_active_slot(slot)) {
 608                 request->slot = slot;
 609                 request->state = RUN_PUT;
 610         } else {
 611                 request->state = ABORTED;
 612                 free(request->url);
 613                 request->url = NULL;
 614         }
 615 }
 616
 617 static void start_move(struct transfer_request *request)
 618 {
 619         struct active_request_slot *slot;
 620         struct curl_slist *dav_headers = NULL;
 621
 622         slot = get_active_slot();
 623         slot->callback_func = process_response;
 624         slot->callback_data = request;
 625         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 626         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 627         dav_headers = curl_slist_append(dav_headers, request->dest);
 628         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 629         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 630         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 631         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 632
 633         if (start_active_slot(slot)) {
 634                 request->slot = slot;
 635                 request->state = RUN_MOVE;
 636         } else {
 637                 request->state = ABORTED;
 638                 free(request->url);
 639                 request->url = NULL;
 640         }
 641 }
 642
 643 static int refresh_lock(struct remote_lock *lock)
 644 {
 645         struct active_request_slot *slot;
 646         struct slot_results results;
 647         struct curl_slist *dav_headers;
 648         int rc = 0;
 649
 650         lock->refreshing = 1;
 651
 652         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 653
 654         slot = get_active_slot();
 655         slot->results = &results;
 656         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 657         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 658         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 659         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 660         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 661
 662         if (start_active_slot(slot)) {
 663                 run_active_slot(slot);
 664                 if (results.curl_result != CURLE_OK) {
 665                         fprintf(stderr, "LOCK HTTP error %ld\n",
 666                                 results.http_code);
 667                 } else {
 668                         lock->start_time = time(NULL);
 669                         rc = 1;
 670                 }
 671         }
 672
 673         lock->refreshing = 0;
 674         curl_slist_free_all(dav_headers);
 675
 676         return rc;
 677 }
 678
 679 static void check_locks(void)
 680 {
 681         struct remote_lock *lock = repo->locks;
 682         time_t current_time = time(NULL);
 683         int time_remaining;
 684
 685         while (lock) {
 686                 time_remaining = lock->start_time + lock->timeout -
 687                         current_time;
 688                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 689                         if (!refresh_lock(lock)) {
 690                                 fprintf(stderr,
 691                                         "Unable to refresh lock for %s\n",
 692                                         lock->url);
 693                                 aborted = 1;
 694                                 return;
 695                         }
 696                 }
 697                 lock = lock->next;
 698         }
 699 }
 700
 701 static void release_request(struct transfer_request *request)
 702 {
 703         struct transfer_request *entry = request_queue_head;
 704
 705         if (request == request_queue_head) {
 706                 request_queue_head = request->next;
 707         } else {
 708                 while (entry->next != NULL && entry->next != request)
 709                         entry = entry->next;
 710                 if (entry->next == request)
 711                         entry->next = entry->next->next;
 712         }
 713
 714         if (request->local_fileno != -1)
 715                 close(request->local_fileno);
 716         if (request->local_stream)
 717                 fclose(request->local_stream);
 718         free(request->url);
 719         free(request);
 720 }
 721
 722 static void finish_request(struct transfer_request *request)
 723 {
 724         struct stat st;
 725         struct packed_git *target;
 726         struct packed_git **lst;
 727         struct active_request_slot *slot;
 728
 729         request->curl_result = request->slot->curl_result;
 730         request->http_code = request->slot->http_code;
 731         slot = request->slot;
 732         request->slot = NULL;
 733
 734         /* Keep locks active */
 735         check_locks();
 736
 737         if (request->headers != NULL)
 738                 curl_slist_free_all(request->headers);
 739
 740         /* URL is reused for MOVE after PUT */
 741         if (request->state != RUN_PUT) {
 742                 free(request->url);
 743                 request->url = NULL;
 744         }
 745
 746         if (request->state == RUN_MKCOL) {
 747                 if (request->curl_result == CURLE_OK ||
 748                     request->http_code == 405) {
 749                         remote_dir_exists[request->obj->sha1[0]] = 1;
 750                         start_put(request);
 751                 } else {
 752                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 753                                 sha1_to_hex(request->obj->sha1),
 754                                 request->curl_result, request->http_code);
 755                         request->state = ABORTED;
 756                         aborted = 1;
 757                 }
 758         } else if (request->state == RUN_PUT) {
 759                 if (request->curl_result == CURLE_OK) {
 760                         start_move(request);
 761                 } else {
 762                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 763                                 sha1_to_hex(request->obj->sha1),
 764                                 request->curl_result, request->http_code);
 765                         request->state = ABORTED;
 766                         aborted = 1;
 767                 }
 768         } else if (request->state == RUN_MOVE) {
 769                 if (request->curl_result == CURLE_OK) {
 770                         if (push_verbosely)
 771                                 fprintf(stderr, "    sent %s\n",
 772                                         sha1_to_hex(request->obj->sha1));
 773                         request->obj->flags |= REMOTE;
 774                         release_request(request);
 775                 } else {
 776                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 777                                 sha1_to_hex(request->obj->sha1),
 778                                 request->curl_result, request->http_code);
 779                         request->state = ABORTED;
 780                         aborted = 1;
 781                 }
 782         } else if (request->state == RUN_FETCH_LOOSE) {
 783                 close(request->local_fileno); request->local_fileno = -1;
 784
 785                 if (request->curl_result != CURLE_OK &&
 786                     request->http_code != 416) {
 787                         if (stat(request->tmpfile, &st) == 0) {
 788                                 if (st.st_size == 0)
 789                                         unlink_or_warn(request->tmpfile);
 790                         }
 791                 } else {
 792                         if (request->http_code == 416)
 793                                 warning("requested range invalid; we may already have all the data.");
 794
 795                         git_inflate_end(&request->stream);
 796                         git_SHA1_Final(request->real_sha1, &request->c);
 797                         if (request->zret != Z_STREAM_END) {
 798                                 unlink_or_warn(request->tmpfile);
 799                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 800                                 unlink_or_warn(request->tmpfile);
 801                         } else {
 802                                 request->rename =
 803                                         move_temp_to_file(
 804                                                 request->tmpfile,
 805                                                 request->filename);
 806                                 if (request->rename == 0) {
 807                                         request->obj->flags |= (LOCAL | REMOTE);
 808                                 }
 809                         }
 810                 }
 811
 812                 /* Try fetching packed if necessary */
 813                 if (request->obj->flags & LOCAL)
 814                         release_request(request);
 815                 else
 816                         start_fetch_packed(request);
 817
 818         } else if (request->state == RUN_FETCH_PACKED) {
 819                 if (request->curl_result != CURLE_OK) {
 820                         fprintf(stderr, "Unable to get pack file %s\n%s",
 821                                 request->url, curl_errorstr);
 822                         repo->can_update_info_refs = 0;
 823                 } else {
 824                         off_t pack_size = ftell(request->local_stream);
 825
 826                         fclose(request->local_stream);
 827                         request->local_stream = NULL;
 828                         slot->local = NULL;
 829                         if (!move_temp_to_file(request->tmpfile,
 830                                                request->filename)) {
 831                                 target = (struct packed_git *)request->userData;
 832                                 target->pack_size = pack_size;
 833                                 lst = &repo->packs;
 834                                 while (*lst != target)
 835                                         lst = &((*lst)->next);
 836                                 *lst = (*lst)->next;
 837
 838                                 if (!verify_pack(target))
 839                                         install_packed_git(target);
 840                                 else
 841                                         repo->can_update_info_refs = 0;
 842                         }
 843                 }
 844                 release_request(request);
 845         }
 846 }
 847
 848 #ifdef USE_CURL_MULTI
 849 static int fill_active_slot(void *unused)
 850 {
 851         struct transfer_request *request;
 852
 853         if (aborted)
 854                 return 0;
 855
 856         for (request = request_queue_head; request; request = request->next) {
 857                 if (request->state == NEED_FETCH) {
 858                         start_fetch_loose(request);
 859                         return 1;
 860                 } else if (pushing && request->state == NEED_PUSH) {
 861                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 862                                 start_put(request);
 863                         } else {
 864                                 start_mkcol(request);
 865                         }
 866                         return 1;
 867                 }
 868         }
 869         return 0;
 870 }
 871 #endif
 872
 873 static void get_remote_object_list(unsigned char parent);
 874
 875 static void add_fetch_request(struct object *obj)
 876 {
 877         struct transfer_request *request;
 878
 879         check_locks();
 880
 881         /*
 882          * Don't fetch the object if it's known to exist locally
 883          * or is already in the request queue
 884          */
 885         if (remote_dir_exists[obj->sha1[0]] == -1)
 886                 get_remote_object_list(obj->sha1[0]);
 887         if (obj->flags & (LOCAL | FETCHING))
 888                 return;
 889
 890         obj->flags |= FETCHING;
 891         request = xmalloc(sizeof(*request));
 892         request->obj = obj;
 893         request->url = NULL;
 894         request->lock = NULL;
 895         request->headers = NULL;
 896         request->local_fileno = -1;
 897         request->local_stream = NULL;
 898         request->state = NEED_FETCH;
 899         request->next = request_queue_head;
 900         request_queue_head = request;
 901
 902 #ifdef USE_CURL_MULTI
 903         fill_active_slots();
 904         step_active_slots();
 905 #endif
 906 }
 907
 908 static int add_send_request(struct object *obj, struct remote_lock *lock)
 909 {
 910         struct transfer_request *request = request_queue_head;
 911         struct packed_git *target;
 912
 913         /* Keep locks active */
 914         check_locks();
 915
 916         /*
 917          * Don't push the object if it's known to exist on the remote
 918          * or is already in the request queue
 919          */
 920         if (remote_dir_exists[obj->sha1[0]] == -1)
 921                 get_remote_object_list(obj->sha1[0]);
 922         if (obj->flags & (REMOTE | PUSHING))
 923                 return 0;
 924         target = find_sha1_pack(obj->sha1, repo->packs);
 925         if (target) {
 926                 obj->flags |= REMOTE;
 927                 return 0;
 928         }
 929
 930         obj->flags |= PUSHING;
 931         request = xmalloc(sizeof(*request));
 932         request->obj = obj;
 933         request->url = NULL;
 934         request->lock = lock;
 935         request->headers = NULL;
 936         request->local_fileno = -1;
 937         request->local_stream = NULL;
 938         request->state = NEED_PUSH;
 939         request->next = request_queue_head;
 940         request_queue_head = request;
 941
 942 #ifdef USE_CURL_MULTI
 943         fill_active_slots();
 944         step_active_slots();
 945 #endif
 946
 947         return 1;
 948 }
 949
 950 static int fetch_index(unsigned char *sha1)
 951 {
 952         char *hex = sha1_to_hex(sha1);
 953         char *filename;
 954         char *url;
 955         char tmpfile[PATH_MAX];
 956         long prev_posn = 0;
 957         char range[RANGE_HEADER_SIZE];
 958         struct curl_slist *range_header = NULL;
 959
 960         FILE *indexfile;
 961         struct active_request_slot *slot;
 962         struct slot_results results;
 963
 964         /* Don't use the index if the pack isn't there */
 965         url = xmalloc(strlen(repo->url) + 64);
 966         sprintf(url, "%sobjects/pack/pack-%s.pack", repo->url, hex);
 967         slot = get_active_slot();
 968         slot->results = &results;
 969         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 970         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 971         if (start_active_slot(slot)) {
 972                 run_active_slot(slot);
 973                 if (results.curl_result != CURLE_OK) {
 974                         free(url);
 975                         return error("Unable to verify pack %s is available",
 976                                      hex);
 977                 }
 978         } else {
 979                 free(url);
 980                 return error("Unable to start request");
 981         }
 982
 983         if (has_pack_index(sha1)) {
 984                 free(url);
 985                 return 0;
 986         }
 987
 988         if (push_verbosely)
 989                 fprintf(stderr, "Getting index for pack %s\n", hex);
 990
 991         sprintf(url, "%sobjects/pack/pack-%s.idx", repo->url, hex);
 992
 993         filename = sha1_pack_index_name(sha1);
 994         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 995         indexfile = fopen(tmpfile, "a");
 996         if (!indexfile) {
 997                 free(url);
 998                 return error("Unable to open local file %s for pack index",
 999                              tmpfile);
1000         }
1001
1002         slot = get_active_slot();
1003         slot->results = &results;
1004         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1005         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1006         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
1007         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1008         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1009         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1010         slot->local = indexfile;
1011
1012         /* If there is data present from a previous transfer attempt,
1013            resume where it left off */
1014         prev_posn = ftell(indexfile);
1015         if (prev_posn>0) {
1016                 if (push_verbosely)
1017                         fprintf(stderr,
1018                                 "Resuming fetch of index for pack %s at byte %ld\n",
1019                                 hex, prev_posn);
1020                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1021                 range_header = curl_slist_append(range_header, range);
1022                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
1023         }
1024
1025         if (start_active_slot(slot)) {
1026                 run_active_slot(slot);
1027                 if (results.curl_result != CURLE_OK) {
1028                         free(url);
1029                         fclose(indexfile);
1030                         slot->local = NULL;
1031                         return error("Unable to get pack index %s\n%s", url,
1032                                      curl_errorstr);
1033                 }
1034         } else {
1035                 free(url);
1036                 fclose(indexfile);
1037                 slot->local = NULL;
1038                 return error("Unable to start request");
1039         }
1040
1041         free(url);
1042         fclose(indexfile);
1043         slot->local = NULL;
1044
1045         return move_temp_to_file(tmpfile, filename);
1046 }
1047
1048 static int setup_index(unsigned char *sha1)
1049 {
1050         struct packed_git *new_pack;
1051
1052         if (fetch_index(sha1))
1053                 return -1;
1054
1055         new_pack = parse_pack_index(sha1);
1056         new_pack->next = repo->packs;
1057         repo->packs = new_pack;
1058         return 0;
1059 }
1060
1061 static int fetch_indices(void)
1062 {
1063         unsigned char sha1[20];
1064         char *url;
1065         struct strbuf buffer = STRBUF_INIT;
1066         char *data;
1067         int i = 0;
1068
1069         struct active_request_slot *slot;
1070         struct slot_results results;
1071
1072         if (push_verbosely)
1073                 fprintf(stderr, "Getting pack list\n");
1074
1075         url = xmalloc(strlen(repo->url) + 20);
1076         sprintf(url, "%sobjects/info/packs", repo->url);
1077
1078         slot = get_active_slot();
1079         slot->results = &results;
1080         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1081         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1082         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1083         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1084         if (start_active_slot(slot)) {
1085                 run_active_slot(slot);
1086                 if (results.curl_result != CURLE_OK) {
1087                         strbuf_release(&buffer);
1088                         free(url);
1089                         if (results.http_code == 404)
1090                                 return 0;
1091                         else
1092                                 return error("%s", curl_errorstr);
1093                 }
1094         } else {
1095                 strbuf_release(&buffer);
1096                 free(url);
1097                 return error("Unable to start request");
1098         }
1099         free(url);
1100
1101         data = buffer.buf;
1102         while (i < buffer.len) {
1103                 switch (data[i]) {
1104                 case 'P':
1105                         i++;
1106                         if (i + 52 < buffer.len &&
1107                             !prefixcmp(data + i, " pack-") &&
1108                             !prefixcmp(data + i + 46, ".pack\n")) {
1109                                 get_sha1_hex(data + i + 6, sha1);
1110                                 setup_index(sha1);
1111                                 i += 51;
1112                                 break;
1113                         }
1114                 default:
1115                         while (data[i] != '\n')
1116                                 i++;
1117                 }
1118                 i++;
1119         }
1120
1121         strbuf_release(&buffer);
1122         return 0;
1123 }
1124
1125 static void one_remote_object(const char *hex)
1126 {
1127         unsigned char sha1[20];
1128         struct object *obj;
1129
1130         if (get_sha1_hex(hex, sha1) != 0)
1131                 return;
1132
1133         obj = lookup_object(sha1);
1134         if (!obj)
1135                 obj = parse_object(sha1);
1136
1137         /* Ignore remote objects that don't exist locally */
1138         if (!obj)
1139                 return;
1140
1141         obj->flags |= REMOTE;
1142         if (!object_list_contains(objects, obj))
1143                 object_list_insert(obj, &objects);
1144 }
1145
1146 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1147 {
1148         int *lock_flags = (int *)ctx->userData;
1149
1150         if (tag_closed) {
1151                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1152                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1153                             (*lock_flags & DAV_PROP_LOCKWR)) {
1154                                 *lock_flags |= DAV_LOCK_OK;
1155                         }
1156                         *lock_flags &= DAV_LOCK_OK;
1157                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1158                         *lock_flags |= DAV_PROP_LOCKWR;
1159                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1160                         *lock_flags |= DAV_PROP_LOCKEX;
1161                 }
1162         }
1163 }
1164
1165 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1166 {
1167         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1168         git_SHA_CTX sha_ctx;
1169         unsigned char lock_token_sha1[20];
1170
1171         if (tag_closed && ctx->cdata) {
1172                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1173                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1174                         strcpy(lock->owner, ctx->cdata);
1175                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1176                         if (!prefixcmp(ctx->cdata, "Second-"))
1177                                 lock->timeout =
1178                                         strtol(ctx->cdata + 7, NULL, 10);
1179                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1180                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1181                         strcpy(lock->token, ctx->cdata);
1182
1183                         git_SHA1_Init(&sha_ctx);
1184                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1185                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
1186
1187                         lock->tmpfile_suffix[0] = '_';
1188                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1189                 }
1190         }
1191 }
1192
1193 static void one_remote_ref(char *refname);
1194
1195 static void
1196 xml_start_tag(void *userData, const char *name, const char **atts)
1197 {
1198         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1199         const char *c = strchr(name, ':');
1200         int new_len;
1201
1202         if (c == NULL)
1203                 c = name;
1204         else
1205                 c++;
1206
1207         new_len = strlen(ctx->name) + strlen(c) + 2;
1208
1209         if (new_len > ctx->len) {
1210                 ctx->name = xrealloc(ctx->name, new_len);
1211                 ctx->len = new_len;
1212         }
1213         strcat(ctx->name, ".");
1214         strcat(ctx->name, c);
1215
1216         free(ctx->cdata);
1217         ctx->cdata = NULL;
1218
1219         ctx->userFunc(ctx, 0);
1220 }
1221
1222 static void
1223 xml_end_tag(void *userData, const char *name)
1224 {
1225         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1226         const char *c = strchr(name, ':');
1227         char *ep;
1228
1229         ctx->userFunc(ctx, 1);
1230
1231         if (c == NULL)
1232                 c = name;
1233         else
1234                 c++;
1235
1236         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1237         *ep = 0;
1238 }
1239
1240 static void
1241 xml_cdata(void *userData, const XML_Char *s, int len)
1242 {
1243         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1244         free(ctx->cdata);
1245         ctx->cdata = xmemdupz(s, len);
1246 }
1247
1248 static struct remote_lock *lock_remote(const char *path, long timeout)
1249 {
1250         struct active_request_slot *slot;
1251         struct slot_results results;
1252         struct buffer out_buffer = { STRBUF_INIT, 0 };
1253         struct strbuf in_buffer = STRBUF_INIT;
1254         char *url;
1255         char *ep;
1256         char timeout_header[25];
1257         struct remote_lock *lock = NULL;
1258         struct curl_slist *dav_headers = NULL;
1259         struct xml_ctx ctx;
1260         char *escaped;
1261
1262         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1263         sprintf(url, "%s%s", repo->url, path);
1264
1265         /* Make sure leading directories exist for the remote ref */
1266         ep = strchr(url + strlen(repo->url) + 1, '/');
1267         while (ep) {
1268                 char saved_character = ep[1];
1269                 ep[1] = '\0';
1270                 slot = get_active_slot();
1271                 slot->results = &results;
1272                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1273                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1274                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1275                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1276                 if (start_active_slot(slot)) {
1277                         run_active_slot(slot);
1278                         if (results.curl_result != CURLE_OK &&
1279                             results.http_code != 405) {
1280                                 fprintf(stderr,
1281                                         "Unable to create branch path %s\n",
1282                                         url);
1283                                 free(url);
1284                                 return NULL;
1285                         }
1286                 } else {
1287                         fprintf(stderr, "Unable to start MKCOL request\n");
1288                         free(url);
1289                         return NULL;
1290                 }
1291                 ep[1] = saved_character;
1292                 ep = strchr(ep + 1, '/');
1293         }
1294
1295         escaped = xml_entities(git_default_email);
1296         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
1297         free(escaped);
1298
1299         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1300         dav_headers = curl_slist_append(dav_headers, timeout_header);
1301         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1302
1303         slot = get_active_slot();
1304         slot->results = &results;
1305         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1306         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1307         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1308 #ifndef NO_CURL_IOCTL
1309         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1310         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1311 #endif
1312         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1313         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1314         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1315         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1316         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1317         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1318
1319         lock = xcalloc(1, sizeof(*lock));
1320         lock->timeout = -1;
1321
1322         if (start_active_slot(slot)) {
1323                 run_active_slot(slot);
1324                 if (results.curl_result == CURLE_OK) {
1325                         XML_Parser parser = XML_ParserCreate(NULL);
1326                         enum XML_Status result;
1327                         ctx.name = xcalloc(10, 1);
1328                         ctx.len = 0;
1329                         ctx.cdata = NULL;
1330                         ctx.userFunc = handle_new_lock_ctx;
1331                         ctx.userData = lock;
1332                         XML_SetUserData(parser, &ctx);
1333                         XML_SetElementHandler(parser, xml_start_tag,
1334                                               xml_end_tag);
1335                         XML_SetCharacterDataHandler(parser, xml_cdata);
1336                         result = XML_Parse(parser, in_buffer.buf,
1337                                            in_buffer.len, 1);
1338                         free(ctx.name);
1339                         if (result != XML_STATUS_OK) {
1340                                 fprintf(stderr, "XML error: %s\n",
1341                                         XML_ErrorString(
1342                                                 XML_GetErrorCode(parser)));
1343                                 lock->timeout = -1;
1344                         }
1345                         XML_ParserFree(parser);
1346                 }
1347         } else {
1348                 fprintf(stderr, "Unable to start LOCK request\n");
1349         }
1350
1351         curl_slist_free_all(dav_headers);
1352         strbuf_release(&out_buffer.buf);
1353         strbuf_release(&in_buffer);
1354
1355         if (lock->token == NULL || lock->timeout <= 0) {
1356                 free(lock->token);
1357                 free(lock->owner);
1358                 free(url);
1359                 free(lock);
1360                 lock = NULL;
1361         } else {
1362                 lock->url = url;
1363                 lock->start_time = time(NULL);
1364                 lock->next = repo->locks;
1365                 repo->locks = lock;
1366         }
1367
1368         return lock;
1369 }
1370
1371 static int unlock_remote(struct remote_lock *lock)
1372 {
1373         struct active_request_slot *slot;
1374         struct slot_results results;
1375         struct remote_lock *prev = repo->locks;
1376         struct curl_slist *dav_headers;
1377         int rc = 0;
1378
1379         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1380
1381         slot = get_active_slot();
1382         slot->results = &results;
1383         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1384         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1385         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1386         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1387
1388         if (start_active_slot(slot)) {
1389                 run_active_slot(slot);
1390                 if (results.curl_result == CURLE_OK)
1391                         rc = 1;
1392                 else
1393                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1394                                 results.http_code);
1395         } else {
1396                 fprintf(stderr, "Unable to start UNLOCK request\n");
1397         }
1398
1399         curl_slist_free_all(dav_headers);
1400
1401         if (repo->locks == lock) {
1402                 repo->locks = lock->next;
1403         } else {
1404                 while (prev && prev->next != lock)
1405                         prev = prev->next;
1406                 if (prev)
1407                         prev->next = prev->next->next;
1408         }
1409
1410         free(lock->owner);
1411         free(lock->url);
1412         free(lock->token);
1413         free(lock);
1414
1415         return rc;
1416 }
1417
1418 static void remove_locks(void)
1419 {
1420         struct remote_lock *lock = repo->locks;
1421
1422         fprintf(stderr, "Removing remote locks...\n");
1423         while (lock) {
1424                 struct remote_lock *next = lock->next;
1425                 unlock_remote(lock);
1426                 lock = next;
1427         }
1428 }
1429
1430 static void remove_locks_on_signal(int signo)
1431 {
1432         remove_locks();
1433         sigchain_pop(signo);
1434         raise(signo);
1435 }
1436
1437 static void remote_ls(const char *path, int flags,
1438                       void (*userFunc)(struct remote_ls_ctx *ls),
1439                       void *userData);
1440
1441 static void process_ls_object(struct remote_ls_ctx *ls)
1442 {
1443         unsigned int *parent = (unsigned int *)ls->userData;
1444         char *path = ls->dentry_name;
1445         char *obj_hex;
1446
1447         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1448                 remote_dir_exists[*parent] = 1;
1449                 return;
1450         }
1451
1452         if (strlen(path) != 49)
1453                 return;
1454         path += 8;
1455         obj_hex = xmalloc(strlen(path));
1456         /* NB: path is not null-terminated, can not use strlcpy here */
1457         memcpy(obj_hex, path, 2);
1458         strcpy(obj_hex + 2, path + 3);
1459         one_remote_object(obj_hex);
1460         free(obj_hex);
1461 }
1462
1463 static void process_ls_ref(struct remote_ls_ctx *ls)
1464 {
1465         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1466                 fprintf(stderr, "  %s\n", ls->dentry_name);
1467                 return;
1468         }
1469
1470         if (!(ls->dentry_flags & IS_DIR))
1471                 one_remote_ref(ls->dentry_name);
1472 }
1473
1474 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1475 {
1476         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1477
1478         if (tag_closed) {
1479                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1480                         if (ls->dentry_flags & IS_DIR) {
1481                                 if (ls->flags & PROCESS_DIRS) {
1482                                         ls->userFunc(ls);
1483                                 }
1484                                 if (strcmp(ls->dentry_name, ls->path) &&
1485                                     ls->flags & RECURSIVE) {
1486                                         remote_ls(ls->dentry_name,
1487                                                   ls->flags,
1488                                                   ls->userFunc,
1489                                                   ls->userData);
1490                                 }
1491                         } else if (ls->flags & PROCESS_FILES) {
1492                                 ls->userFunc(ls);
1493                         }
1494                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1495                         char *path = ctx->cdata;
1496                         if (*ctx->cdata == 'h') {
1497                                 path = strstr(path, "//");
1498                                 if (path) {
1499                                         path = strchr(path+2, '/');
1500                                 }
1501                         }
1502                         if (path) {
1503                                 path += repo->path_len;
1504                                 ls->dentry_name = xstrdup(path);
1505                         }
1506                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1507                         ls->dentry_flags |= IS_DIR;
1508                 }
1509         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1510                 free(ls->dentry_name);
1511                 ls->dentry_name = NULL;
1512                 ls->dentry_flags = 0;
1513         }
1514 }
1515
1516 /*
1517  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1518  * should _only_ heed the information from that file, instead of trying to
1519  * determine the refs from the remote file system (badly: it does not even
1520  * know about packed-refs).
1521  */
1522 static void remote_ls(const char *path, int flags,
1523                       void (*userFunc)(struct remote_ls_ctx *ls),
1524                       void *userData)
1525 {
1526         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1527         struct active_request_slot *slot;
1528         struct slot_results results;
1529         struct strbuf in_buffer = STRBUF_INIT;
1530         struct buffer out_buffer = { STRBUF_INIT, 0 };
1531         struct curl_slist *dav_headers = NULL;
1532         struct xml_ctx ctx;
1533         struct remote_ls_ctx ls;
1534
1535         ls.flags = flags;
1536         ls.path = xstrdup(path);
1537         ls.dentry_name = NULL;
1538         ls.dentry_flags = 0;
1539         ls.userData = userData;
1540         ls.userFunc = userFunc;
1541
1542         sprintf(url, "%s%s", repo->url, path);
1543
1544         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1545
1546         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1547         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1548
1549         slot = get_active_slot();
1550         slot->results = &results;
1551         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1552         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1553         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1554 #ifndef NO_CURL_IOCTL
1555         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1556         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1557 #endif
1558         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1559         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1560         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1561         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1562         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1563         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1564
1565         if (start_active_slot(slot)) {
1566                 run_active_slot(slot);
1567                 if (results.curl_result == CURLE_OK) {
1568                         XML_Parser parser = XML_ParserCreate(NULL);
1569                         enum XML_Status result;
1570                         ctx.name = xcalloc(10, 1);
1571                         ctx.len = 0;
1572                         ctx.cdata = NULL;
1573                         ctx.userFunc = handle_remote_ls_ctx;
1574                         ctx.userData = &ls;
1575                         XML_SetUserData(parser, &ctx);
1576                         XML_SetElementHandler(parser, xml_start_tag,
1577                                               xml_end_tag);
1578                         XML_SetCharacterDataHandler(parser, xml_cdata);
1579                         result = XML_Parse(parser, in_buffer.buf,
1580                                            in_buffer.len, 1);
1581                         free(ctx.name);
1582
1583                         if (result != XML_STATUS_OK) {
1584                                 fprintf(stderr, "XML error: %s\n",
1585                                         XML_ErrorString(
1586                                                 XML_GetErrorCode(parser)));
1587                         }
1588                         XML_ParserFree(parser);
1589                 }
1590         } else {
1591                 fprintf(stderr, "Unable to start PROPFIND request\n");
1592         }
1593
1594         free(ls.path);
1595         free(url);
1596         strbuf_release(&out_buffer.buf);
1597         strbuf_release(&in_buffer);
1598         curl_slist_free_all(dav_headers);
1599 }
1600
1601 static void get_remote_object_list(unsigned char parent)
1602 {
1603         char path[] = "objects/XX/";
1604         static const char hex[] = "0123456789abcdef";
1605         unsigned int val = parent;
1606
1607         path[8] = hex[val >> 4];
1608         path[9] = hex[val & 0xf];
1609         remote_dir_exists[val] = 0;
1610         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1611                   process_ls_object, &val);
1612 }
1613
1614 static int locking_available(void)
1615 {
1616         struct active_request_slot *slot;
1617         struct slot_results results;
1618         struct strbuf in_buffer = STRBUF_INIT;
1619         struct buffer out_buffer = { STRBUF_INIT, 0 };
1620         struct curl_slist *dav_headers = NULL;
1621         struct xml_ctx ctx;
1622         int lock_flags = 0;
1623         char *escaped;
1624
1625         escaped = xml_entities(repo->url);
1626         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1627         free(escaped);
1628
1629         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1630         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1631
1632         slot = get_active_slot();
1633         slot->results = &results;
1634         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1635         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1636         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1637 #ifndef NO_CURL_IOCTL
1638         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1639         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1640 #endif
1641         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1642         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1643         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1644         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1645         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1646         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1647
1648         if (start_active_slot(slot)) {
1649                 run_active_slot(slot);
1650                 if (results.curl_result == CURLE_OK) {
1651                         XML_Parser parser = XML_ParserCreate(NULL);
1652                         enum XML_Status result;
1653                         ctx.name = xcalloc(10, 1);
1654                         ctx.len = 0;
1655                         ctx.cdata = NULL;
1656                         ctx.userFunc = handle_lockprop_ctx;
1657                         ctx.userData = &lock_flags;
1658                         XML_SetUserData(parser, &ctx);
1659                         XML_SetElementHandler(parser, xml_start_tag,
1660                                               xml_end_tag);
1661                         result = XML_Parse(parser, in_buffer.buf,
1662                                            in_buffer.len, 1);
1663                         free(ctx.name);
1664
1665                         if (result != XML_STATUS_OK) {
1666                                 fprintf(stderr, "XML error: %s\n",
1667                                         XML_ErrorString(
1668                                                 XML_GetErrorCode(parser)));
1669                                 lock_flags = 0;
1670                         }
1671                         XML_ParserFree(parser);
1672                         if (!lock_flags)
1673                                 error("no DAV locking support on %s",
1674                                       repo->url);
1675
1676                 } else {
1677                         error("Cannot access URL %s, return code %d",
1678                               repo->url, results.curl_result);
1679                         lock_flags = 0;
1680                 }
1681         } else {
1682                 error("Unable to start PROPFIND request on %s", repo->url);
1683         }
1684
1685         strbuf_release(&out_buffer.buf);
1686         strbuf_release(&in_buffer);
1687         curl_slist_free_all(dav_headers);
1688
1689         return lock_flags;
1690 }
1691
1692 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1693 {
1694         struct object_list *entry = xmalloc(sizeof(struct object_list));
1695         entry->item = obj;
1696         entry->next = *p;
1697         *p = entry;
1698         return &entry->next;
1699 }
1700
1701 static struct object_list **process_blob(struct blob *blob,
1702                                          struct object_list **p,
1703                                          struct name_path *path,
1704                                          const char *name)
1705 {
1706         struct object *obj = &blob->object;
1707
1708         obj->flags |= LOCAL;
1709
1710         if (obj->flags & (UNINTERESTING | SEEN))
1711                 return p;
1712
1713         obj->flags |= SEEN;
1714         return add_one_object(obj, p);
1715 }
1716
1717 static struct object_list **process_tree(struct tree *tree,
1718                                          struct object_list **p,
1719                                          struct name_path *path,
1720                                          const char *name)
1721 {
1722         struct object *obj = &tree->object;
1723         struct tree_desc desc;
1724         struct name_entry entry;
1725         struct name_path me;
1726
1727         obj->flags |= LOCAL;
1728
1729         if (obj->flags & (UNINTERESTING | SEEN))
1730                 return p;
1731         if (parse_tree(tree) < 0)
1732                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1733
1734         obj->flags |= SEEN;
1735         name = xstrdup(name);
1736         p = add_one_object(obj, p);
1737         me.up = path;
1738         me.elem = name;
1739         me.elem_len = strlen(name);
1740
1741         init_tree_desc(&desc, tree->buffer, tree->size);
1742
1743         while (tree_entry(&desc, &entry))
1744                 switch (object_type(entry.mode)) {
1745                 case OBJ_TREE:
1746                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1747                         break;
1748                 case OBJ_BLOB:
1749                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1750                         break;
1751                 default:
1752                         /* Subproject commit - not in this repository */
1753                         break;
1754                 }
1755
1756         free(tree->buffer);
1757         tree->buffer = NULL;
1758         return p;
1759 }
1760
1761 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1762 {
1763         int i;
1764         struct commit *commit;
1765         struct object_list **p = &objects;
1766         int count = 0;
1767
1768         while ((commit = get_revision(revs)) != NULL) {
1769                 p = process_tree(commit->tree, p, NULL, "");
1770                 commit->object.flags |= LOCAL;
1771                 if (!(commit->object.flags & UNINTERESTING))
1772                         count += add_send_request(&commit->object, lock);
1773         }
1774
1775         for (i = 0; i < revs->pending.nr; i++) {
1776                 struct object_array_entry *entry = revs->pending.objects + i;
1777                 struct object *obj = entry->item;
1778                 const char *name = entry->name;
1779
1780                 if (obj->flags & (UNINTERESTING | SEEN))
1781                         continue;
1782                 if (obj->type == OBJ_TAG) {
1783                         obj->flags |= SEEN;
1784                         p = add_one_object(obj, p);
1785                         continue;
1786                 }
1787                 if (obj->type == OBJ_TREE) {
1788                         p = process_tree((struct tree *)obj, p, NULL, name);
1789                         continue;
1790                 }
1791                 if (obj->type == OBJ_BLOB) {
1792                         p = process_blob((struct blob *)obj, p, NULL, name);
1793                         continue;
1794                 }
1795                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1796         }
1797
1798         while (objects) {
1799                 if (!(objects->item->flags & UNINTERESTING))
1800                         count += add_send_request(objects->item, lock);
1801                 objects = objects->next;
1802         }
1803
1804         return count;
1805 }
1806
1807 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1808 {
1809         struct active_request_slot *slot;
1810         struct slot_results results;
1811         struct buffer out_buffer = { STRBUF_INIT, 0 };
1812         struct curl_slist *dav_headers;
1813
1814         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1815
1816         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1817
1818         slot = get_active_slot();
1819         slot->results = &results;
1820         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1821         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1822         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1823 #ifndef NO_CURL_IOCTL
1824         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1825         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1826 #endif
1827         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1828         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1829         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1830         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1831         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1832         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1833
1834         if (start_active_slot(slot)) {
1835                 run_active_slot(slot);
1836                 strbuf_release(&out_buffer.buf);
1837                 if (results.curl_result != CURLE_OK) {
1838                         fprintf(stderr,
1839                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1840                                 results.curl_result, results.http_code);
1841                         /* We should attempt recovery? */
1842                         return 0;
1843                 }
1844         } else {
1845                 strbuf_release(&out_buffer.buf);
1846                 fprintf(stderr, "Unable to start PUT request\n");
1847                 return 0;
1848         }
1849
1850         return 1;
1851 }
1852
1853 static struct ref *remote_refs, **remote_tail;
1854
1855 static void one_remote_ref(char *refname)
1856 {
1857         struct ref *ref;
1858         struct object *obj;
1859
1860         ref = alloc_ref(refname);
1861
1862         if (http_fetch_ref(repo->url, ref) != 0) {
1863                 fprintf(stderr,
1864                         "Unable to fetch ref %s from %s\n",
1865                         refname, repo->url);
1866                 free(ref);
1867                 return;
1868         }
1869
1870         /*
1871          * Fetch a copy of the object if it doesn't exist locally - it
1872          * may be required for updating server info later.
1873          */
1874         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1875                 obj = lookup_unknown_object(ref->old_sha1);
1876                 if (obj) {
1877                         fprintf(stderr, "  fetch %s for %s\n",
1878                                 sha1_to_hex(ref->old_sha1), refname);
1879                         add_fetch_request(obj);
1880                 }
1881         }
1882
1883         *remote_tail = ref;
1884         remote_tail = &ref->next;
1885 }
1886
1887 static void get_dav_remote_heads(void)
1888 {
1889         remote_tail = &remote_refs;
1890         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1891 }
1892
1893 static int is_zero_sha1(const unsigned char *sha1)
1894 {
1895         int i;
1896
1897         for (i = 0; i < 20; i++) {
1898                 if (*sha1++)
1899                         return 0;
1900         }
1901         return 1;
1902 }
1903
1904 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1905 {
1906         struct strbuf *buf = (struct strbuf *)ls->userData;
1907         struct object *o;
1908         int len;
1909         char *ref_info;
1910         struct ref *ref;
1911
1912         ref = alloc_ref(ls->dentry_name);
1913
1914         if (http_fetch_ref(repo->url, ref) != 0) {
1915                 fprintf(stderr,
1916                         "Unable to fetch ref %s from %s\n",
1917                         ls->dentry_name, repo->url);
1918                 aborted = 1;
1919                 free(ref);
1920                 return;
1921         }
1922
1923         o = parse_object(ref->old_sha1);
1924         if (!o) {
1925                 fprintf(stderr,
1926                         "Unable to parse object %s for remote ref %s\n",
1927                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1928                 aborted = 1;
1929                 free(ref);
1930                 return;
1931         }
1932
1933         len = strlen(ls->dentry_name) + 42;
1934         ref_info = xcalloc(len + 1, 1);
1935         sprintf(ref_info, "%s   %s\n",
1936                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1937         fwrite_buffer(ref_info, 1, len, buf);
1938         free(ref_info);
1939
1940         if (o->type == OBJ_TAG) {
1941                 o = deref_tag(o, ls->dentry_name, 0);
1942                 if (o) {
1943                         len = strlen(ls->dentry_name) + 45;
1944                         ref_info = xcalloc(len + 1, 1);
1945                         sprintf(ref_info, "%s   %s^{}\n",
1946                                 sha1_to_hex(o->sha1), ls->dentry_name);
1947                         fwrite_buffer(ref_info, 1, len, buf);
1948                         free(ref_info);
1949                 }
1950         }
1951         free(ref);
1952 }
1953
1954 static void update_remote_info_refs(struct remote_lock *lock)
1955 {
1956         struct buffer buffer = { STRBUF_INIT, 0 };
1957         struct active_request_slot *slot;
1958         struct slot_results results;
1959         struct curl_slist *dav_headers;
1960
1961         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1962                   add_remote_info_ref, &buffer.buf);
1963         if (!aborted) {
1964                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1965
1966                 slot = get_active_slot();
1967                 slot->results = &results;
1968                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1969                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1970                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1971 #ifndef NO_CURL_IOCTL
1972                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1973                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1974 #endif
1975                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1976                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1977                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1978                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1979                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1980                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1981
1982                 if (start_active_slot(slot)) {
1983                         run_active_slot(slot);
1984                         if (results.curl_result != CURLE_OK) {
1985                                 fprintf(stderr,
1986                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1987                                         results.curl_result, results.http_code);
1988                         }
1989                 }
1990         }
1991         strbuf_release(&buffer.buf);
1992 }
1993
1994 static int remote_exists(const char *path)
1995 {
1996         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1997         struct active_request_slot *slot;
1998         struct slot_results results;
1999         int ret = -1;
2000
2001         sprintf(url, "%s%s", repo->url, path);
2002
2003         slot = get_active_slot();
2004         slot->results = &results;
2005         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2006         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2007
2008         if (start_active_slot(slot)) {
2009                 run_active_slot(slot);
2010                 if (results.http_code == 404)
2011                         ret = 0;
2012                 else if (results.curl_result == CURLE_OK)
2013                         ret = 1;
2014                 else
2015                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2016         } else {
2017                 fprintf(stderr, "Unable to start HEAD request\n");
2018         }
2019
2020         free(url);
2021         return ret;
2022 }
2023
2024 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2025 {
2026         char *url;
2027         struct strbuf buffer = STRBUF_INIT;
2028         struct active_request_slot *slot;
2029         struct slot_results results;
2030
2031         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
2032         sprintf(url, "%s%s", repo->url, path);
2033
2034         slot = get_active_slot();
2035         slot->results = &results;
2036         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2037         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2038         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2039         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2040         if (start_active_slot(slot)) {
2041                 run_active_slot(slot);
2042                 if (results.curl_result != CURLE_OK) {
2043                         die("Couldn't get %s for remote symref\n%s",
2044                             url, curl_errorstr);
2045                 }
2046         } else {
2047                 die("Unable to start remote symref request");
2048         }
2049         free(url);
2050
2051         free(*symref);
2052         *symref = NULL;
2053         hashclr(sha1);
2054
2055         if (buffer.len == 0)
2056                 return;
2057
2058         /* If it's a symref, set the refname; otherwise try for a sha1 */
2059         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2060                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2061         } else {
2062                 get_sha1_hex(buffer.buf, sha1);
2063         }
2064
2065         strbuf_release(&buffer);
2066 }
2067
2068 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2069 {
2070         struct commit *head = lookup_commit(head_sha1);
2071         struct commit *branch = lookup_commit(branch_sha1);
2072         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2073
2074         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2075 }
2076
2077 static int delete_remote_branch(char *pattern, int force)
2078 {
2079         struct ref *refs = remote_refs;
2080         struct ref *remote_ref = NULL;
2081         unsigned char head_sha1[20];
2082         char *symref = NULL;
2083         int match;
2084         int patlen = strlen(pattern);
2085         int i;
2086         struct active_request_slot *slot;
2087         struct slot_results results;
2088         char *url;
2089
2090         /* Find the remote branch(es) matching the specified branch name */
2091         for (match = 0; refs; refs = refs->next) {
2092                 char *name = refs->name;
2093                 int namelen = strlen(name);
2094                 if (namelen < patlen ||
2095                     memcmp(name + namelen - patlen, pattern, patlen))
2096                         continue;
2097                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2098                         continue;
2099                 match++;
2100                 remote_ref = refs;
2101         }
2102         if (match == 0)
2103                 return error("No remote branch matches %s", pattern);
2104         if (match != 1)
2105                 return error("More than one remote branch matches %s",
2106                              pattern);
2107
2108         /*
2109          * Remote HEAD must be a symref (not exactly foolproof; a remote
2110          * symlink to a symref will look like a symref)
2111          */
2112         fetch_symref("HEAD", &symref, head_sha1);
2113         if (!symref)
2114                 return error("Remote HEAD is not a symref");
2115
2116         /* Remote branch must not be the remote HEAD */
2117         for (i=0; symref && i<MAXDEPTH; i++) {
2118                 if (!strcmp(remote_ref->name, symref))
2119                         return error("Remote branch %s is the current HEAD",
2120                                      remote_ref->name);
2121                 fetch_symref(symref, &symref, head_sha1);
2122         }
2123
2124         /* Run extra sanity checks if delete is not forced */
2125         if (!force) {
2126                 /* Remote HEAD must resolve to a known object */
2127                 if (symref)
2128                         return error("Remote HEAD symrefs too deep");
2129                 if (is_zero_sha1(head_sha1))
2130                         return error("Unable to resolve remote HEAD");
2131                 if (!has_sha1_file(head_sha1))
2132                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2133
2134                 /* Remote branch must resolve to a known object */
2135                 if (is_zero_sha1(remote_ref->old_sha1))
2136                         return error("Unable to resolve remote branch %s",
2137                                      remote_ref->name);
2138                 if (!has_sha1_file(remote_ref->old_sha1))
2139                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2140
2141                 /* Remote branch must be an ancestor of remote HEAD */
2142                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2143                         return error("The branch '%s' is not an ancestor "
2144                                      "of your current HEAD.\n"
2145                                      "If you are sure you want to delete it,"
2146                                      " run:\n\t'git http-push -D %s %s'",
2147                                      remote_ref->name, repo->url, pattern);
2148                 }
2149         }
2150
2151         /* Send delete request */
2152         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2153         if (dry_run)
2154                 return 0;
2155         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
2156         sprintf(url, "%s%s", repo->url, remote_ref->name);
2157         slot = get_active_slot();
2158         slot->results = &results;
2159         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2160         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2161         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2162         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2163         if (start_active_slot(slot)) {
2164                 run_active_slot(slot);
2165                 free(url);
2166                 if (results.curl_result != CURLE_OK)
2167                         return error("DELETE request failed (%d/%ld)\n",
2168                                      results.curl_result, results.http_code);
2169         } else {
2170                 free(url);
2171                 return error("Unable to start DELETE request");
2172         }
2173
2174         return 0;
2175 }
2176
2177 int main(int argc, char **argv)
2178 {
2179         struct transfer_request *request;
2180         struct transfer_request *next_request;
2181         int nr_refspec = 0;
2182         char **refspec = NULL;
2183         struct remote_lock *ref_lock = NULL;
2184         struct remote_lock *info_ref_lock = NULL;
2185         struct rev_info revs;
2186         int delete_branch = 0;
2187         int force_delete = 0;
2188         int objects_to_send;
2189         int rc = 0;
2190         int i;
2191         int new_refs;
2192         struct ref *ref, *local_refs;
2193         struct remote *remote;
2194         char *rewritten_url = NULL;
2195
2196         git_extract_argv0_path(argv[0]);
2197
2198         setup_git_directory();
2199
2200         repo = xcalloc(sizeof(*repo), 1);
2201
2202         argv++;
2203         for (i = 1; i < argc; i++, argv++) {
2204                 char *arg = *argv;
2205
2206                 if (*arg == '-') {
2207                         if (!strcmp(arg, "--all")) {
2208                                 push_all = MATCH_REFS_ALL;
2209                                 continue;
2210                         }
2211                         if (!strcmp(arg, "--force")) {
2212                                 force_all = 1;
2213                                 continue;
2214                         }
2215                         if (!strcmp(arg, "--dry-run")) {
2216                                 dry_run = 1;
2217                                 continue;
2218                         }
2219                         if (!strcmp(arg, "--verbose")) {
2220                                 push_verbosely = 1;
2221                                 continue;
2222                         }
2223                         if (!strcmp(arg, "-d")) {
2224                                 delete_branch = 1;
2225                                 continue;
2226                         }
2227                         if (!strcmp(arg, "-D")) {
2228                                 delete_branch = 1;
2229                                 force_delete = 1;
2230                                 continue;
2231                         }
2232                 }
2233                 if (!repo->url) {
2234                         char *path = strstr(arg, "//");
2235                         repo->url = arg;
2236                         repo->path_len = strlen(arg);
2237                         if (path) {
2238                                 repo->path = strchr(path+2, '/');
2239                                 if (repo->path)
2240                                         repo->path_len = strlen(repo->path);
2241                         }
2242                         continue;
2243                 }
2244                 refspec = argv;
2245                 nr_refspec = argc - i;
2246                 break;
2247         }
2248
2249 #ifndef USE_CURL_MULTI
2250         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2251 #endif
2252
2253         if (!repo->url)
2254                 usage(http_push_usage);
2255
2256         if (delete_branch && nr_refspec != 1)
2257                 die("You must specify only one branch name when deleting a remote branch");
2258
2259         memset(remote_dir_exists, -1, 256);
2260
2261         /*
2262          * Create a minimum remote by hand to give to http_init(),
2263          * primarily to allow it to look at the URL.
2264          */
2265         remote = xcalloc(sizeof(*remote), 1);
2266         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
2267         remote->url[remote->url_nr++] = repo->url;
2268         http_init(remote);
2269
2270         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2271
2272         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
2273                 rewritten_url = xmalloc(strlen(repo->url)+2);
2274                 strcpy(rewritten_url, repo->url);
2275                 strcat(rewritten_url, "/");
2276                 repo->path = rewritten_url + (repo->path - repo->url);
2277                 repo->path_len++;
2278                 repo->url = rewritten_url;
2279         }
2280
2281         /* Verify DAV compliance/lock support */
2282         if (!locking_available()) {
2283                 rc = 1;
2284                 goto cleanup;
2285         }
2286
2287         sigchain_push_common(remove_locks_on_signal);
2288
2289         /* Check whether the remote has server info files */
2290         repo->can_update_info_refs = 0;
2291         repo->has_info_refs = remote_exists("info/refs");
2292         repo->has_info_packs = remote_exists("objects/info/packs");
2293         if (repo->has_info_refs) {
2294                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2295                 if (info_ref_lock)
2296                         repo->can_update_info_refs = 1;
2297                 else {
2298                         error("cannot lock existing info/refs");
2299                         rc = 1;
2300                         goto cleanup;
2301                 }
2302         }
2303         if (repo->has_info_packs)
2304                 fetch_indices();
2305
2306         /* Get a list of all local and remote heads to validate refspecs */
2307         local_refs = get_local_heads();
2308         fprintf(stderr, "Fetching remote heads...\n");
2309         get_dav_remote_heads();
2310
2311         /* Remove a remote branch if -d or -D was specified */
2312         if (delete_branch) {
2313                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2314                         fprintf(stderr, "Unable to delete remote branch %s\n",
2315                                 refspec[0]);
2316                 goto cleanup;
2317         }
2318
2319         /* match them up */
2320         if (!remote_tail)
2321                 remote_tail = &remote_refs;
2322         if (match_refs(local_refs, remote_refs, &remote_tail,
2323                        nr_refspec, (const char **) refspec, push_all)) {
2324                 rc = -1;
2325                 goto cleanup;
2326         }
2327         if (!remote_refs) {
2328                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2329                 rc = 0;
2330                 goto cleanup;
2331         }
2332
2333         new_refs = 0;
2334         for (ref = remote_refs; ref; ref = ref->next) {
2335                 char old_hex[60], *new_hex;
2336                 const char *commit_argv[4];
2337                 int commit_argc;
2338                 char *new_sha1_hex, *old_sha1_hex;
2339
2340                 if (!ref->peer_ref)
2341                         continue;
2342
2343                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2344                         if (delete_remote_branch(ref->name, 1) == -1) {
2345                                 error("Could not remove %s", ref->name);
2346                                 rc = -4;
2347                         }
2348                         new_refs++;
2349                         continue;
2350                 }
2351
2352                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2353                         if (push_verbosely || 1)
2354                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2355                         continue;
2356                 }
2357
2358                 if (!force_all &&
2359                     !is_zero_sha1(ref->old_sha1) &&
2360                     !ref->force) {
2361                         if (!has_sha1_file(ref->old_sha1) ||
2362                             !ref_newer(ref->peer_ref->new_sha1,
2363                                        ref->old_sha1)) {
2364                                 /*
2365                                  * We do not have the remote ref, or
2366                                  * we know that the remote ref is not
2367                                  * an ancestor of what we are trying to
2368                                  * push.  Either way this can be losing
2369                                  * commits at the remote end and likely
2370                                  * we were not up to date to begin with.
2371                                  */
2372                                 error("remote '%s' is not an ancestor of\n"
2373                                       "local '%s'.\n"
2374                                       "Maybe you are not up-to-date and "
2375                                       "need to pull first?",
2376                                       ref->name,
2377                                       ref->peer_ref->name);
2378                                 rc = -2;
2379                                 continue;
2380                         }
2381                 }
2382                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2383                 new_refs++;
2384                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2385                 new_hex = sha1_to_hex(ref->new_sha1);
2386
2387                 fprintf(stderr, "updating '%s'", ref->name);
2388                 if (strcmp(ref->name, ref->peer_ref->name))
2389                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2390                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2391                 if (dry_run)
2392                         continue;
2393
2394                 /* Lock remote branch ref */
2395                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2396                 if (ref_lock == NULL) {
2397                         fprintf(stderr, "Unable to lock remote branch %s\n",
2398                                 ref->name);
2399                         rc = 1;
2400                         continue;
2401                 }
2402
2403                 /* Set up revision info for this refspec */
2404                 commit_argc = 3;
2405                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2406                 old_sha1_hex = NULL;
2407                 commit_argv[1] = "--objects";
2408                 commit_argv[2] = new_sha1_hex;
2409                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2410                         old_sha1_hex = xmalloc(42);
2411                         sprintf(old_sha1_hex, "^%s",
2412                                 sha1_to_hex(ref->old_sha1));
2413                         commit_argv[3] = old_sha1_hex;
2414                         commit_argc++;
2415                 }
2416                 init_revisions(&revs, setup_git_directory());
2417                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2418                 revs.edge_hint = 0; /* just in case */
2419                 free(new_sha1_hex);
2420                 if (old_sha1_hex) {
2421                         free(old_sha1_hex);
2422                         commit_argv[1] = NULL;
2423                 }
2424
2425                 /* Generate a list of objects that need to be pushed */
2426                 pushing = 0;
2427                 if (prepare_revision_walk(&revs))
2428                         die("revision walk setup failed");
2429                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2430                 objects_to_send = get_delta(&revs, ref_lock);
2431                 finish_all_active_slots();
2432
2433                 /* Push missing objects to remote, this would be a
2434                    convenient time to pack them first if appropriate. */
2435                 pushing = 1;
2436                 if (objects_to_send)
2437                         fprintf(stderr, "    sending %d objects\n",
2438                                 objects_to_send);
2439 #ifdef USE_CURL_MULTI
2440                 fill_active_slots();
2441                 add_fill_function(NULL, fill_active_slot);
2442 #endif
2443                 do {
2444                         finish_all_active_slots();
2445 #ifdef USE_CURL_MULTI
2446                         fill_active_slots();
2447 #endif
2448                 } while (request_queue_head && !aborted);
2449
2450                 /* Update the remote branch if all went well */
2451                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2452                         rc = 1;
2453
2454                 if (!rc)
2455                         fprintf(stderr, "    done\n");
2456                 unlock_remote(ref_lock);
2457                 check_locks();
2458         }
2459
2460         /* Update remote server info if appropriate */
2461         if (repo->has_info_refs && new_refs) {
2462                 if (info_ref_lock && repo->can_update_info_refs) {
2463                         fprintf(stderr, "Updating remote server info\n");
2464                         if (!dry_run)
2465                                 update_remote_info_refs(info_ref_lock);
2466                 } else {
2467                         fprintf(stderr, "Unable to update server info\n");
2468                 }
2469         }
2470
2471  cleanup:
2472         free(rewritten_url);
2473         if (info_ref_lock)
2474                 unlock_remote(info_ref_lock);
2475         free(repo);
2476
2477         curl_slist_free_all(no_pragma_header);
2478
2479         http_cleanup();
2480
2481         request = request_queue_head;
2482         while (request != NULL) {
2483                 next_request = request->next;
2484                 release_request(request);
2485                 request = next_request;
2486         }
2487
2488         return rc;
2489 }